2 years ago

When to reverse the inequality sign when you are solving an inequality

Mathematics

1 answer:

Serga [27]2 years ago

8 0

When you're dividing by a negative number

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I need help asap please

rjkz [21]

Answer:

$x = -\frac{3}{2}$ or $x = 1$

Step-by-step explanation:

Using the zero product property, first step is to set the given equation, $2x^2 + x - 1 = 2$ , to zero. Then factorise the left side.

Thus,

$2x^2 + x - 1 = 2$

Subtract 2 from both sides

$2x^2 + x - 1 - 2 = 2 - 2$

$2x^2 + x - 3 = 0$

Factorise the left side

$2x^2 + 3x - 2x - 3 = 0$

$x(2x + 3) - 1(2x + 3) = 0$

$(x - 1)(2x + 3) = 0$

Find the solution

$x - 1 = 0$

$2x + 3 = 0$

$x = 1$

$2x + 3 = 0$

$2x = -3$

$x = -\frac{3}{2}$

The answer is: $x = 1$ or $x = -\frac{3}{2}$

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3 years ago

Help. Only two questions.

anastassius [24]

6; because they are an equal distance apart

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2 years ago

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can you simplify 183/100 to fraction (it is improper fraction and i need to know if it can be simplified or not)

NikAS [45]

You can turn it into a mixed number 1 83
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100

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3 years ago

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7. 20% of what number is 18?

Tom [10]

The answer is 90

20%of 99=18

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2 years ago

PLS GIVE ANSWER AND TELL ME EXACTLY HOW YOU GOT IT

PIT_PIT [208]

A) Y U Z { B, C, D, F, G, H, K, T, L, M, N, W}
b) n(YUZ) {5} (<em>n</em> is the number of elements in the set)
c) X AND Y {K}
d) n(X AND Y) {16}

I'm not sure of that notation for e and f. Can you tell me what the X\Y means?

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2 years ago