What is the factored form of 4x2 + 23x – 72?

(x + 8 )(4x - 9)

using the a-c method

consider the factors of the product 4 × - 72 = - 288 which sum to + 23

The factors are + 32 and - 9

split the middle term using these factors

4x² + 32x - 9x - 72 ( factor by grouping )

= 4x( x + 8) - 9( x + 8)

take out the common factor ( x + 8)

= (x + 8 )(4x - 9 )

8 2/3 is the answer

step-by-step explanation: just use a calculator

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.