The sum of five times the square number and four times the number is 28.How to sove it please??

Answers (1)

well we suppose that unknow number is X .
Five times the square of number is 5X^2
the four times of number is 4X
we make an equation:
5X^2+4X=28
Solve this equation: 5X^2+4X-28=0
there are two solutions :
X=2 or X=-2.8

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