Question

which of the following quadratic equations have roots as 3 and 5
a)x^2 – 3x + 5 = 0
b)x^2+5x+3=0
c)x^2+8x+5=0
d)x^2-8x+15=0

Answer 1

Answer:

d

Step-by-step explanation:

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Answer 2

QUESTION:

which of the following quadratic equations have roots as 3 and 5

a)x^2 – 3x + 5 = 0

b)x^2+5x+3=0

c)x^2+8x+5=0

d)x^2-8x+15=0.

ANSWER:

In order to find the roots first of all we have to factorised it.

Quadratic equations is in the form of

$a {x}^{2} + bx + c = 0$

1. WE have to split the middle term in such a way that it's sum equal to b and product equal to a×c.

2. Then we take common factor.

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YOUR ANSWER IS OPTION D.

${x}^{2} - 8x + 15 = 0$

${x}^{2} - 5x - 3x + 15 = 0 \\ x(x - 5) - 3(x - 5) \\ (x - 3)(x - 5)$

(x-3)(x-5).

$x - 3 = 0 \\ x = 3$

$x - 5 = 0 \\ x - 5$

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