a² + 2a - 5 = - 4
1) - 2a² - 4a + 10 = - 2(a² + 2a - 5) = - 1 * (- 4) = 8
2) a² + 2a - 5 = - 4
a² + 2a = - 4 + 5 = 1
a²(a² + 2a - 5) + 2a(a² + 2a - 5) = (a² + 2a - 5)(a² + 2a) = - 4 * 1 = - 4
3) 4a² + 8a - 16 = 4(a² + 2a) - 16 = 4 * 1 - 16 = - 12
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a² + 2a - 5 = - 4
1) - 2a² - 4a + 10 = - 2(a² + 2a - 5) = - 1 * (- 4) = 8
2) a² + 2a - 5 = - 4
a² + 2a = - 4 + 5 = 1
a²(a² + 2a - 5) + 2a(a² + 2a - 5) = (a² + 2a - 5)(a² + 2a) = - 4 * 1 = - 4
3) 4a² + 8a - 16 = 4(a² + 2a) - 16 = 4 * 1 - 16 = - 12