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yzafer9308
15.10.2020 •
Mathematics
Solve 6x² +11x -35 =0
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Ответ:
Step-by-step explanation: If you're asked to solve a quadratic equation by the method of your choice, you should always check to see if the quadratic factors before you try any other method.
In this case, we have a trinomial that
factors as the product of two binomials.
In the first position for each binomial, we will use
our factors of 6x² which are either 6x · x or 3x · 2x.
It's a good idea to try less extreme extreme factors.
That means choose factors a little closer together.
So 3x and 2x would be first on our list.
We do the same for the factors of -35.
Since our constant term is negative, it will factor
as the product of a positive times a negative.
So the factors of -35 are +7 · -5, -5 · +7, -7 · +5, +5 · -7.
Remember to reverse the order of the
factors is your lead coefficient is not 1.
The factors that work in this case are -5 and +7.
So we have (3x - 5)(2x + 7).
To check, take the product of the outer terms and inner terms.
So we have -21x + 10x which is our middle term.
Now set it equal to 0.
So we have (3x - 5)(2x + 7) = 0.
Now use the zero product property.
So either 3x - 5 = 0 or 2x + 7 = 0.
Solving each equation from here, we have x = 5/3 or x = -7/2.
Ответ: