x+4x-21 ke suniyak kya he
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Step-by-step explanation:
X²+4x-21=0
by middle term splitting
x²-7x+3x-21=0
=>x(x-7)+3(x-7)=0
=>(x-7)(x+3)=0
:. x-7=0 and x+3=0
=> x=7 or x= -3
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