3cm= 30mm
8cm= 80mm
c^2 = a^2 + b^2
= 30^2 + 80^2
= 7300
c= square root of 7300
= 85.44003745
= 85mm
Hope this helps!
Answer:
c = -9
Step-by-step explanation:
4(c + 2) = -28
Divide both sides by 4.
c + 2 = -7
Subtract 2 from both sides.
c = -9
Answer:
4w+12
Step-by-step explanation:
p=2l+2w
p=2w+2w+6+6
p=4w+12
Answer:
Step-by-step explanation:
2x²-2x-12 = 2 (x²-x - 6)
but : x²-x - 6 = x² - 2(1/2)x +(1/2)² - (1/2)² - 6
= ( x - 1/2)² - 1/4 - 6
= ( x - 1/2)² - 25/4
x²-x - 6 = ( x - 1/2)² - (5/2)²
by identity ; a² - b² = (a - b ) ( a +b)
x²-x - 6 = ( x - 1/2 - 5/2) ( x - 1/2 +5/2)
x²-x - 6 = (x - 3) (x +2)
so : 2x²-2x-12 =2(x - 3) (x +2) = (2x-6)(x+2) .......(factored form)
now : 2x²-2x-12 = 0 : 2x - 6 = 0 or x+2 = 0
x= 3 or x = - 2 two solutions