Question

4a²(5a-3b)-5a²(4a+b) a= -2 b= -3

Answer 1

4•4(-10+9)-5•4(-8-3)=-8+220=212

Answer 2

To evaluate the expression 4a²(5a-3b) - 5a²(4a+b) when a = -2 and b = -3, simply substitute the given values for a and b into the expression and perform the calculations:

Step 1: Substitute the values of a and b into the expression: 4(-2)²(5(-2) - 3(-3)) - 5(-2)²(4(-2) + (-3))

Step 2: Perform the calculations inside the parentheses: 4(4)(-10 + 9) - 5(4)(-8 - 3)

Step 3: Continue with the calculations inside the parentheses: 4(4)(-1) - 5(4)(-11)

Step 4: Multiply the numbers outside the parentheses: 16(-1) - 20(-11)

Step 5: Complete the calculations: -16 + 220

Step 6: Final answer: The result of the expression 4a²(5a-3b) - 5a²(4a+b) when a = -2 and b = -3 is 204.