2x^2 - 3x - 20in^2

Answer 1

Hello, Ini

When you find area of a rectangle you multiply base by height;

Since area is given, you will do inverse which is factoring

the area is 2x² - 3x -20

since coefficient of x² is 2,

first multiply 2 by -20 and we get -40

then factor -40; when combine these factors you need to get b which is -3 for that question

some factors of -40 are

-20*2. nope

-10*4. nope

-8*5. yes! that works

2x² - 3x -20 = 2x² +5x -8x -20 = 𝑥(2𝑥+5)−4(2𝑥+5) = (𝑥−4)(2𝑥+5)

so, dimensions are (2𝑥+5) and (𝑥−4)

hope that helps

Answer 2

If I understand the question (very confusing), you should factor it out (roots of your quadratic equation):

Therefore, you can write it as 2 binomials (2x+5)(x−4)

P.S: I missed 2 at the beginning.