2x+4x=10find value of x
Answers
Answered by
2
2x+4x=10
6x=10
x=10/6
x=1.66
Answered by
0
Answer:
I can solve it with many methods-
1st method-
2x + 4 = 10
2x = 6
x = 3
2nd method-
Subtract 4 from both sides
we get 2x = 6
x= 3
3rd method-
Square both sides
(2x+4)2=102(2x+4)2=102
4x2+16x+16=1004x2+16x+16=100 {as we know (a+b)2=a2+2ab+b2(a+b)2=a2+2ab+b2}
4x2+16x−84=04x2+16x−84=0
4x2+28x−12x−84=04x2+28x−12x−84=0 (by factorisation)
4x(x+7)−12(x+7)=04x(x+7)−12(x+7)=0
(4x−12)(x+7)=0(4x−12)(x+7)=0
4x=124x=12 or x=−7x=−7
x=3x=3 or x=−7x=−7
We put 1st value of x in LHS, 2(3)+4 = 10
We put 2nd value of x in LHS, 2(-7)+4 = -10
So 2nd value of x should not be considered
Hence answer is 3
Step-by-step explanation:
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