Factored form of x^2-3x-4

Mathematics

2 answers:

Agata [3.3K]2 years ago

6 0

Answer:

x=4,x=-1

Step-by-step explanation:

x2-3x-4

To factorise we will need to get two numbers that when added it will give -3 and the same two numbers when multiplied it will give you-4

The two numbers involved is -4 and +1

x2-4x+x-4

Let's factorise

x(x-4)+1(x-4)

(x-4)(x+1)

x-4=0

Make x the subject of formula

x=4

x+1=0

Let's make x the subject of formula

x=-1

kolbaska11 [484]2 years ago

5 0

(x + 1) x (x - 4). When you check it you will get your original expression.

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Which expression is equivalent to square root 55x^7y6/11x^11y^8

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Answer:

$\large\boxed{\sqrt{\dfrac{55x^7y^6}{11x^{11}y^8}}=\dfrac{\sqrt5}{x^2y}}$

Step-by-step explanation:

$\sqrt{\dfrac{55x^7y^6}{11x^{11}y^8}}=\sqrt{\dfrac{55}{11}\cdot\dfrac{x^7}{x^{11}}\cdot\dfrac{y^6}{y^8}}\qquad\text{use}\ \dfrac{a^n}{a^m}=a^{n-m}\\\\=\sqrt{5x^{7-11}y^{6-8}}=\sqrt{5x^{-4}y^{-2}}\qquad\text{use}\ \sqrt{ab}=\sqrt{a}\cdot\sqrt{b}\\\\=\sqrt5\cdot\sqrt{x^{-4}}\cdot\sqrt{y^{-2}}=\sqrt5\cdot\sqrt{x^{(-2)(2)}}\cdot\sqrt{y^{(-1)(2)}}\qquad\text{use}\ (a^n)^m=a^{nm}\\\\=\sqrt5\cdot\sqrt{(x^{-2})^2}\cdot\sqrt{(y^{-1})^2}\qquad\text{use}\ \sqrt{a^2}=a$

$=\sqrt5\cdot x^{-2}\cdot y^{-1}\qquad\text{use}\ a^{-n}=\dfrac{1}{a^n}\to a^{-1}=\dfrac{1}{a}\\\\=\sqrt5\cdot\dfrac{1}{x^2}\cdot\dfrac{1}{y}=\dfrac{\sqrt5}{x^2y}$