Question

Factor completely 3ab − 5ax + 9b − 15x.
(3b + 5x)(a + 3)
(3b − 5x)(a + 3)
(3b − 5x)(a − 3)
Prime
Question 2(Multiple Choice Worth 1 points)
(08.02)
Factor completely 5x(x + 3) + 6(x + 3).
(x + 3)(30x)
(x + 3)(5x + 6)
(x + 3)(11x)
Prime
Question 3(Multiple Choice Worth 1 points)
(08.02)
Factor completely 2cb + 7cx + 2b + 7x.
(2b − 7x)(c − 1)
(2b + 7x)(c + 1)
(2b − 7x)(c + 1)
Prime
Question 4(Multiple Choice Worth 2 points)
(08.02)
Factor completely 21x3 + 35x2 + 9x + 15.
(3x − 5)(7x2 − 3)
(3x − 5)(7x2 + 3)
(3x + 5)(7x2 − 3)
(3x + 5)(7x2 + 3)
Question 5(Multiple Choice Worth 1 points)
(08.02)
Factor completely 9xy + 36x − 10y − 40.
Prime
(y − 4)(9x − 10)
(y + 4)(9x + 10)
(y + 4)(9x − 10)
Question 6(Multiple Choice Worth 2 points)
(08.02)
Factor completely 14bx2 − 7x3 − 4b + 2x.
(2b + x)(7x2 + 2)
(2b − x)(7x2 − 2)
(2b + x)(7x2 − 2)
Prime
Question 7(Multiple Choice Worth 2 points)
(08.02)
Factor completely 4xy + 9x + 24y + 54.
(4y − 9)(x − 6)
(4y − 9)(x + 6)
(4y + 9)(x − 6)
(4y + 9)(x + 6)

Answer 1

Answer:  The answers are given below.

Step-by-step explanation:  We are given to factorise some quadratic expressions.

We will be using the following factorisation formula:

$x^2+ax+bx+ab=(x+a)(x+b).$

The factorisation is as follows:

We have

$(1)~3ab-5ax+9b-15x\\\\=a(3b-5x)+3(3b-5x)\\\\=(3b-5x)(a+3).$

Thus, option (B) $(3b-5x)(a+3)$ is correct.

$(2)~5x(x+3)+6(x+3)\\\\=(x+3)(5x+6).$

Thus, option (B) $(x+3)(5x+6)$ is correct.

$(3)~2cb+7cx+2b+7x\\\\=c(2b+7x)+1(2b+7x)\\\\=(2b+7x)(c+1).$

Thus, option (B) $(2b+7x)(c+1)$ is correct

$(4)~21x^3+35x^2+9x+15\\\\=7x^2(3x+5)+3(3x+5)\\\\=(3x+5)(7x^2+3).$

Thus, option (D) $(3x+5)(7x^2+3)$ is correct.

$(5)~9xy+36x-10y-40\\\\=9x(y+4)-10(y+4)=(y+4)(9x-10).$

Thus, option (C) $(y+4)(9x-10)$ is the correct option.

$(6)~14bx^2-7x^3-4b+2x\\\\=7x^2(2b-x)-2(2b-x)\\\\=(2b-x)(7x^2-2).$

Thus, option (B) $(2b-x)(7x^2-2)$ is the correct option.

$(7)~4xy+9x+24y+54\\\\=x(4y+9)+6(4y+9)\\\\=(4y+9)(x+6).$

Thus, option (D) $(4y+9)(x+6)$  is correct.

Answer 2

Answer:

The correct Answer is D. (4y + 9)(x + 6)

Step-by-step explanation:

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