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Novosadov [1.4K]
3 years ago
6

What is the product of (2x-1)(x+4)

Mathematics
1 answer:
Novay_Z [31]3 years ago
4 0

Answer:

\large\boxed{(2x-1)(x+4)=2x^2+7x-4}

Step-by-step explanation:

(2x-1)(x+4)\qquad\text{use FOIL:}\ (a+b)(c+d)=ac+ad+bc+bd\\\\=(2x)(x)+(2x)(4)+(-1)(x)+(-1)(4)\\\\=2x^2+8x-x-4\qquad\text{combine like terms}\\\\=2x^2+(8x-x)-4\\\\=2x^2+7x-4

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Simplify using the distributive property. 5 Marks<br> 1/5(4m+20)<br><br> 9(5/9 y-1/3)
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Black_prince [1.1K]

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You can also work this using improper fractions:

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3 years ago
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Let's solve this system of equations through substitution.

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Next, let us move y to the right side of the equation.

x+y=3 -------> x=3-y (x equals 3-y)

Because we found out that what x is in terms of y, we can input that in for every instance of x in this equation below.

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We have a one variable equation now and can solve for y.

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Plug in 7 for y in any equation to find x.

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answer: x=-4, y=7

3 0
3 years ago
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