This is confusing someone help please

Mathematics

1 answer:

Marat540 [252]2 years ago

4 0

Answer:

Below in BOLD.

Step-by-step explanation:

5x^2 - 6x - 2 = 0

Quadratic formula for ax^2 + bx + c = 0 is

x = [-b ± √(b^2 - 4ac)]/ 2a

Here we have a = 5, b = -6 and c = -2

so x = [-(-6) ± √((-6)^2 - 4*5*-2)]/ 2*5

= [ 6 ± √(36 + 40)] / 10

= 0.6 ± √76 / 10

= 0.6 ± 0.8718

= 1.4718, -0.2718

= 1.5, -0.3 to one decimal place.

x^2 + 3x = 40

x^2 + 3x - 40 = 0

We can factor this one:

(x - 5)(x + 8) = 0

x - 5 = 0 giving x = 5 and

x + 8 = 0 giving x = -8.

Answer x = -8, 5.

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