4.3 × 10⁴ = 43,000.
That's because 10⁴ means you're going to be moving the decimal place 4 times to the right.
4.3 moved one decimal place to the right (aka 10¹ = 10) is just 43, because you're doing 4.3 × 10.
Therefore, 4.3 moved two decimal places (10² = 100) is 430.
4.3 moved three decimal places (10³ = 1,000) is 4,300.
And finally, 4.3 moved four decimal places (10⁴ = 10,000) is 43,000, and that's your answer.
