Question

Tiply the following polynomials: (5pts each) i) (3x-8)•(4x+7)= ii) (4x + 7)² = ¡¡¡) (3x –8)•(3x+8)=

Answer 1

We have

`(3x-8)•\mleft(4x+7\mright)`

First we will multiply 3x by 4x, then 3x by 7, then -8 by 4x and then -8 by 7

`(3x\cdot4x)+(3x\cdot7)+(-8\cdot4x)+(-8\cdot7)`
`12x^2+21x-32x-56`

then we sum similar terms and we obtain the answer

`12x^2-11x-56`