. What is the value of the expression 4x(3 − x) + 5x(x − 2) for x= −3?
explain plz
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4x (3-x) + 5x (x - 2) where x =-3
12x - 4x² +5x² - 10x
Substituting x =-3 we get
12 (-3) - 4(-3)² +5 (-3)² - 10(-3)
= - 36 - 4 (9)+5 (+9) - 30
= - 36 +36 +45 - 30
= +45 - 30
= 15
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