Answer: 2) 4x - 8 - 8y
Step-by-step explanation:
if xy=4
then y(x-4)(x+2) use foil method with parenthisies to get
y(x²+2x-4x-8) foil again
x²y+2xy-4xy-8y plug 4 in for xy
x²y+2(4)-4(4)-8y solve what u can
x²y+8-16-8y= x²y-8-8y
for x²y if you take out the exponent you have an xy and an x so when u plug in 4 you get 4x ending up with a solution of
4x-8-8y
Hope that helped
Answer:
18 units
Step-by-step explanation:
Answer:
5 cm
Step-by-step explanation:
Let the shorter side be a, longer side be b, hypotenuse be c
By Pythagorean theorem:
a² + b² = c²
a² + (a + 7)² = (a + 8)²
a² + a² + 14a + 49 = a² + 16a + 64
a² - 2a - 15 = 0
a² + 3a - 5a - 15 = 0
a(a + 3) - 5(a + 3) = 0
(a + 3)(a - 5) = 0
a = -3 or a = 5
Because a is a side length and is a positive number
a = 5
I don't know about the first one but the second one is 34.9°. It would be that because are right angles add up to 90° and if you subract 55.1 and 90 it would equal 34.9. But this rule only works on right angles.
