Solve x^2 - 9 = 8x. class10 ncert ch4
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Answer:
Move
8 x
to the left side of the equation by subtracting it from both sides.
x 2 − 9 − 8 x = 0
Use the quadratic formula to find the solutions.
− b ± √ b 2 − 4 ( a c ) 2 a
Substitute the values
a = 1 , b = − 8 , and c = − 9
into the quadratic formula and solve for
x . 8 ± √ ( − 8 ) 2 − 4 ⋅ ( 1 ⋅ − 9 ) 2 ⋅ 1
Simplify.
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x = 4 ± 5
The final answer is the combination of both solutions.
x = 9 , - 1
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