Answer:
x²(9x– 11)(9x + 11)
Step-by-step explanation:
81x⁴ – 121x²
The expression can be factorised as follow:
81x⁴ – 121x²
x² is common to both term. Thus:
81x⁴ – 121x² = x²(81x² – 121)
Recall:
81 = 9²
121 = 11²
Therefore,
x²(81x² – 121) = x²(9²x² – 11²)
= x²[(9x)² – 11²]
Difference of two squares
x²(9x– 11)(9x + 11)
Therefore,
81x⁴ – 121x² = x²(9x– 11)(9x + 11)
No because they are straight lines, they cannot curve to intersect more than once, think of a capital X.
Answer:
2 & 20
Step-by-step explanation:
100 x 2= 200
20 x 10= 200
the answer is 16.5cm
just add 15 +1.5 and you get 16.5
Answer:
19
Step-by-step explanation:
1/2*(5+x)*4=48
