3 years ago

Please help!!!!!!!!!!

1 answer:

6 0

Here, Equation: 3x² - 5x - 2
a = 3, b = -5, c = -2

So, Roots = -b +- √d / 2a
5 _+ √25 + 24 / 6

In short, Your Answer would be: Option A

Hope this helps!

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The difference of two numbers, a and b, is 21. The difference of 5 times a and two times b is 18. What are the values of a and b

PSYCHO15rus [73]

A-b=21
5a-2b=18

We can use substitution here. Take the first equation and solve for A. (Picking this one because it's easy)

a = 21+b

Plugin to the second equation:5(21+b)-2b=18
Simplify: 105 + 5b - 2b = 18
Simplify: 105 + 3b = 18
Subtract both sides: 3b = 18-105
Simplify: 3b = -87
Divide: b = -29

Plug back into the first: a=21+b
a = 21 - 29
a = -8

Option D

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