Answer:
I just got done doing this. Full answers to all 4 problems are down below. All correct answers are bolded.
Step-by-step explanation:
First problem: x2 + -8 x = 9
Add 16 to each side x2 – 8x = 9 to complete the square.
Now that you have x² - 8x + 16 = 9 + 16, apply the square root property to the equation. Answer: (x – 4)² = 25
Choose the solutions to the quadratic equation x2 – 8x – 9 = 0. Answer: -1, 9
The equation x² - 8x - 9 = 0 can be written as x² +(-8x) = 9 which is of the form x² + bx = c where,
b = -8
c = 9
An equation is a mathematical statement which equate two algebraic expressions. An equation has an equal to (=) sign in between the expression.
The given equation is
x² - 8x - 9 = 0.
⇒ x² - 8x = 9
⇒ x² +(-8x) = 9
So the given equation is written of the form x² + bx = c, where,
b = -8
c = 9
Find more about "Equations" here : https://brainly.com/question/1833682
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