Question

b)X (X + 3) = 5x - 10​

Answer 1

X (X + 3) = 5x - 10​

$X (X + 3) = 5x - 10​i\\\\\\x\left(x+3\right)=5x-10\\\\\\x^2+3x=5x-10\\\\\\x^2+3x+10=5x-10+10\\\\\\x^2+3x+10=5x\\\\\\x^2+3x+10-5x=5x-5x\\\\\\x^2-2x+10=0\\\\\\x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\\\\\\\\x=\frac{-\left(-2\right)+\sqrt{\left(-2\right)^2-4\cdot \:1\cdot \:10}}{2\cdot \:1}:\quad 1+3i\\\\\\x=\frac{-\left(-2\right)-\sqrt{\left(-2\right)^2-4\cdot \:1\cdot \:10}}{2\cdot \:1}:\quad 1-3i\\\\x=1+3i,\:x=1-3i$

Espero Ter Ajudado

Answer 2

x(x + 3) = 5x - 10

x² + 3x = 5x - 10

x + 3x - 5x + 10 = 0

x² - 2x + 10 = 0

Coeficientes:

a = 1

b = - 2

c = 10