Question

The product of (4z2 + 7z – 8) and (–z + 3) is –4z3 + xz2 + yz – 24.

What is the value of x?

What is the value of y?

Answer 1

x=5

y=29

Explanation:

Answer 2

• x = 5
• y = 29

Explanation:

The z² term comes from the sum of products ...

... (4z²)(+3) + (7z)(-z) = z²(12 -7) = 5z²

x is the z² coefficient, so is 5.

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The z term comes from the sum of products ...

... (7z)(+3) + (-8)(-z) = z(21 +8) = 29z

y is the z coefficient, so is 29.