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(x-3)(x+8)
x1=3
x2=-8
a. 3x₁ - 2x₂
3(3) - 2(-8) = 9+16 = 25 cm
b. x₁² + 4x₁x₂ + 4x₂²
3² +4(3)(-8) + 4(-8)²
9 -96 +256 = 169