Question

Please explain -5x(squared)-3x+8 I have to factorise it and I don’t get it. Help please?

Answer 1

Answer:

The answer is: 5(x+8)(-x+1)

Step-by-step explanation:

To factorize, you can take the FACTORS of 5x^2 and 8. Once you factor them, multiply them cross ways, like CROSS MULTIPLICATION. Moreover, if you do this and get -3x, then you have the factorization. For example

-5x^2 -3x + 8  

5x              8

-x                1

Then cross multiply to get: -8x + 5x= -3x (this is correct)

Now you can find the factorization by just going across: (5x+8)(-x+1)

It is basically guess and check.

Answer 2

Answer:

Answer = (-x +1) (5x +8)

Step-by-step explanation:

-5x² - 3x + 8

To factorize: we look for two numbers that their sum will give -3 and their product will give = -5 × 8 = -40

The numbers are -8 and 5 (hint: -8 +5 = -3 and -8 × 5 = -40)

-5x² - 8x + 5x + 8

-x(5x + 8) +1(5x +8)

(-x +1) (5x +8)