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3 years ago

Find the roots. 2x 2 + 7x - 15 =0

Mathematics

2 answers:

sdas [7]3 years ago

7 0

Answer:

-5, 3/2

Step-by-step explanation:

Reika [66]3 years ago

4 0

So you always want to pull out the gcf first but since there isn't one, we can move on.
so we can make an acb chart which is multiplying the a value and the c value and find factors that of that product that will equal the b value.
a value is 2
c value is -15
b value is 7
-30 factors to equal 7 = 10, -3
10 - 3 = 7
so the factors 10 and -3 work.
so now you make 2 separate parenthesis with one of the factors and one x. and it should be set equal to 0.
(x+10)(x-3) = 0
now solve for x in each separate parenthesis.
x = -10
x = 3
those r the roots
hope this helps

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Natasha2012 [34]

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Solution:

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Let "y" be the number of granny smith apples bought

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Cost of 1 granny smith apple = $ 0.25

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Therefore,

number of gala apples bought + number of granny smith apples bought = 19

x + y = 19 --------- eqn 1

The total cost of the apples is $5.10

Therefore, we can frame a equation as:

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Let us solve eqn 1 and eqn 2

From eqn 1,

x = 19 - y ---------- eqn 3

Substitute eqn 3 in eqn 2

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Vladimir79 [104]

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spin [16.1K]

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Step-by-step explanation:

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<h3>Substitution</h3>

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Checking answer choices against the problem statement is one of many possible strategies for answering multiple-choice questions.

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