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Nady [450]
3 years ago
12

If 2x 2 + 13x – 7 = 0, then x could equal to which of the following?

Biology
2 answers:
djverab [1.8K]3 years ago
5 0

Answer:

x = 1/2 and x = -7

Explanation:

you need to factor

multiply 2 x -7 to get -14

then find factors of -14 that add to give you 13

14 and -1 work

now rewrite the original equation but replace 13x with 14x - 1x

so 2x^2 + 14x - 1x -7 = 0

now factor by grouping

(2x^2 + 14x) (-1x - 7) = 0

factor the greatest common factor out of each group

2x(x + 7) -1(x + 7) = 0

the factors are (2x - 1) (x + 7) = 0

set each factor equal to zero and solve both for x

2x - 1 = 0                    x + 7 = 0

    +1    +1                       - 7   - 7

2x = 1                           x = -7

÷2  ÷2

x = 1/2

algol133 years ago
4 0

Answer:3/13

Explanation:

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