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Ratling [72]
3 years ago
5

Simplify (7x-1)(2x+5)

Mathematics
2 answers:
Sergio039 [100]3 years ago
6 0

\text{Simplify by using FOIL}\\\\\text{(First, Outside, Inside, Last}\\\\\text{Solve:}\\\\(7x-1)(2x+5)\\\\(7x)(2x)+(7x)(5)+(-1)(2x)+(-1)(5)\\\\14x^2+35x-2x-5\\\\\text{Combine like terms}\\\\\boxed{14x^2+33x-5}

Alex73 [517]3 years ago
5 0

Step-by-step explanation:

(7x-1)(2x+5) = 0 \\ 14x {}^{2}  + 35x - 2x - 5 = 0 \\ 14x {}^{2}  + 33x - 5 = 0 \\

now,

14 {x}^{2}   - 2x + 35x - 5 = 0 \\ 2x(7x - 1) + 5(7x - 1) = 0 \\ (2x + 5)(7x - 1) = 0 \\ 2x + 5 = 0 \:  \:  \:  \: or \:  \:  \:  \:  \: 7x - 1 = 0 \\ \\  x =  -  \frac{5}{2}  \:  \:  \:  \: or \:  \:  \:  \: x =  \frac{1}{7}

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We have to,

write a word problem for this equation,

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