Evaluate the expression 7a² - 3b³ when a) a= 4, b= -2 b) a= -8, b=5 You will end up with 2 answers here, substitute and solve.

Answer

Step-by-step explanation:

7a²-3b²

Replace a=4, b=2

7*4²-3*2²

= 112-12

= 100 first answer

7a²-3b²

Replace a=8, b=5

7*8²-3*5²

448-75

= 373 second answer

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