Question

check whether the following are quadratic equation or not. (x+3) (x-5)=12x+7.


with step by step equation​

Answer 1

Answer:

$(x + 3)(x - 5) = 12x + 7 \\ x(x - 5) + 3(x - 5) = 12x + 7 \\ {x}^{2} - 5x + 3x - 15 = 12x + 7 \\ {x}^{2} - 2x - 12x = 7 + 15 \\ {x}^{2} - 14x = 22$

Yes it is quadratic equation because, one of the power of x is 2.

Answer 2

Answer:

Mark as brainliest answer.

Step-by-step explanation:

→ (x + 3)(x - 5) = 12x + 7

→ x × x - x × 5 + 3 × x - 3 × 5 = 12x + 7

→ x² - 5x + 3x - 15 = 12x + 7

→ x² - 2x - 15 = 12x + 7

→ x² - 2x - 12x - 15 - 7

→ x² - 14x - 22

→ It is a quadratic equation.