Every real number is irrational this is true
Lets say that 2 out of 7 people are left handed so the ratio to right handed people to left handed people would be 2:7
For every one unit to the right we go up one unit, i.e. rise/run = 1/1 = 1. That's a textbook slope of 1.
Answer: 1
You change the Y sign.
L = 1, -2
Q = 4, 1
G = 3, -4
3) x² - 121 = 0
x² = 121
x' = +√121
x' = 11
_______________
x'' = - √121
x'' = -11
Solution ⇒ S{-11 ; 11 } or (x-11)(x+11)
4) 4x² + 144 = 0
4x² = -144
x² = -144 / 4
x² = -36
x = √-36
No solution ⇒ S = ∅
5) z²+10z+21 = 0
Δ = 10² - 4(1)(21)
Δ = 100 - 84
Δ = 16
x' = (-10+4) / 2 = -6/2 = -3
x'' = (-10-4) / 2 = -14/2 = -7
Solution ⇒ S{ -7 ; -3} or (x+3)(x+7)
