Set 10: Quadratic Equations (Advanced)

Explanation

Answer: A

Which function has an x-intercept at $x = 4$ ?

$y = x - 4$

✓ Correct

$y = x + 4$

$y = x^2 + 16$

$y = (x + 4)^2$

Detailed Explanation

Choice A is correct. Choice A is the correct answer. If a function has an x-intercept at $x=4$ , then $f(4)$ must equal 0. * A: $4- 4 = 0$ . (Correct) * B: $4+ 4 = 8$ . * C: $4^2 + 16 = 32$ . * D: $(4 + 4)^2 = 64$ . Choice B is incorrect because $4 +4=8$ . Choice C is incorrect because $16 +16=32$ . Choice D is incorrect because $8^2=64$ .

Key Steps:

•

The correct answer is $y = x - 4$

Why others are wrong:

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

← Previous Next →

🎯 Keep Practicing!

Master all sections for your best SAT score

📚Reading & Writing→📖Vocabulary→