Evaluate the expression given below for a= -4 (iii) 7a^2+7a-20(iv) a^3+2a^2-a+5
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7a² + 7a + 20 = 7(-4)² + 7(-4) - 20 = 112 - 28 - 20 = 64
a³ + 2a² - a + 5 = (-4)³ + 2(-4)² - (-4) + 5 = -64 + 32 + 4 + 5 = - 23
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