Question

Guided Practice

Fill in the blank.

(z−4)(2z+1)=
`2z^(2)`− ___ z−4


A.
7z


B.
9


C.
7

Answer 1

7

Explanation:

(z – 4)(2z + 1) = z(2z + 1) – 4(2z + 1) = 2z2 + z – 8z – 4 = 2z2 – 7z – 4

The second term is –7z, so 7 fills in the blank.

Answer 2

Answer: Gradpoint answer

C.

7

Step-by-step explanation: Math.way answer

Move all terms to the left side and set equal to zero. Then set each factor equal to zero.

Exact Form:

z = 0 , 7/ 4

Decimal Form:

z = 0 , 1.75

Mixed Number Form:

z = 0 , 1 3/ 4