Question

x²+ 4x = 21
x=?
please answer this
give BRAINLIEST​

Answer 1

Step-by-step explanation:

pata nahi bro mai maths me utna accha noi hu

Answer 2

$\LARGE{{\textsf{\textbf{ Question - }}}}$

x²+ 4x = 21

x=?

$\LARGE{{\textsf{\textbf{ Answer - }}}}$

$: \Longrightarrow\sf{ {x}^{2} + 4x = 21}$

$: \Longrightarrow\sf{ {x}^{2} + 4x - 21 = 0}$

$: \Longrightarrow\sf{ {x}^{2} + 7x - 3x - 21 = 0}$

$: \Longrightarrow\sf{ {x}(x + 7) - 3(x + 7) = 0}$

$: \Longrightarrow\sf{ (x - 3)(x + 7) = 0}$

now ,

$: \Longrightarrow\sf{ x = + 3}$

$: \Longrightarrow\sf{ x = - 7}$