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lesantik [10]
3 years ago
5

X^2-4x+c find the value of c

Mathematics
1 answer:
Sonbull [250]3 years ago
8 0

Answer:

c = 4

Step-by-step explanation:

Given

x^2 - 4x + c

Required

Find c

The question is incomplete. However, I'll assume the expression is a perfect square.

To find c, we make use of the following formula

c = (\frac{b}{2})^2

Where

ax^2 + bx + c

By comparison with x^2 - 4x + c

a =1

b = -4

So, c = (\frac{b}{2})^2 becomes

c = (\frac{-4}{2})^2

c = (-2)^2

c = 4

<em>The value of c that makes the expression, </em>x^2 - 4x + c<em> a perfect square is 4 and the expression is: </em>x^2 - 4x + 4<em></em>

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The value of x is a third of the value of 45-10x
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Answer:

x = 45/13, also x = 3 6/13

Step-by-step explanation:

is = equal sign

of = multiply

<u>Equation:</u>

x = 1/3 (45-10x)

To do this, you could easily do communitive property of multiplication, but to make it more understandable I will use reversing.

1. Simplify. Multiply - Divide.

x=\frac{45-10x}{3}

2. Factor out common term 5.

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3. Multiply both sides by 3.

3x=5(9-2x)

4. Expand.

3x=45-10x

5. Add <em>10x</em> to both sides.

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