Question

Срочно

1)-4x=7x^2

2)X²+x=90

Answer 1

$1) - 4х-7х^2=0</p><p>-х(4+7х)=0</p><p>х=0 и 4+7х=0</p><p>7х=0-4=-4</p><p>х=-4÷7=-4/7</p><p>[tex]2)x(x + 1) = 90 \\ x = 0 \\ x + 1 = 90 \\ x = 90 - 1 \\ x = 89$