Question

21=resolva cada equação a)x.(x+1)+240 b)(x+3)2=2x(x+7) c)(3y+2)(y-1)=y.(y+2)

Answer 1

a) x. ( x + 1 ) + 240

x² + x + 240 = 0

-1 ± √1² - 4.1.240 ÷ 2.1

-1 ± √ 961 ÷ 2

-1 ± 31 ÷ 2

x¹ = -1 - 31 ÷ 2 = -16

x² = -1 + 31 ÷ 2 = 15