Factorise fully (a+b)²-c² ​

(a + b + c)(a + b - c)

Step-by-step explanation:

(a + b)² - c² ← is a difference of squares and factors in general as

x² - y² = (x + y)(x - y)

Here x = a + b and y = c , then

(a + b)² - c²

= (a + b + c)(a + b - c)

answer: do you still need this?

d (5 x (-20)) * (100 x (0.7))

step-by-step explanation:

5÷1/100 * -.7 *-20

copy dot flip

5*100 * -.7 *-20

rearrange

5*-20   * 100 *-.7

-100   *-70

7000