3x²-12x-60=0
simplify by dividing by 3: x²-4x-20=0
cannot be factored, use the quadratic formula: √(b²-4ac)=√[(-4)²-4*1*(-20)]=√96=4√6
x=2+2√2 or x=2-2√2
Answer:
71.51
Step-by-step explanation:
A=ah+bh+ch+1
2﹣a4+2(ab)2+2(ac)2﹣b4+2(bc)2﹣c4=3·3+7·3+7·3+1
2·﹣34+2·(3·7)2+2·(3·7)2﹣74+2·(7·7)2﹣74=71.51219
Answer:
60cm
Step-by-step explanation:
Length of 1 side = 5cm [ A cube has 12 edges]
Length of 12 sides = 5*12
= 60cm
Answer:
72
Step-by-step explanation:
80x.90= 72
