1.x²+4x-5=0 2.x²=5x-4

1.x²+4x-5=0 2.x²=5x-4

1、x²+4x-5=0
(X+5)(X-1)=0
X+5=0
X-1=0
X1=-5
X2=1
2、 x²-5x+4=0
(X-4)(X-1)=0
X-4=0
X-1=0
X1=4
X2=1
Classmate, although I have answered your questions, I said to you as a big brother: I believe you can solve these problems by yourself with a little brain, and you will have a sense of achievement only with your own hands in the future!

There are steps to solve the following equation by formula method. Thank you
(1)x^2-x-1=0
(2)2x^2-9x+8=0
(3)5x+2=3x^2
(4)3y^2+1=2√3y
(5)(2x-1)(x-2)=-1
(6)-3x^2+22x-24=0

Steps of formula method
The standard formula ax ^ 2 + BX + C = 0 is formed to get the value of ABC
Substituting formula x = [- B + - (b ^ 2-4ac)] / 2A
Simplification results
For example, question 1 x ^ 2-x-1 = 0
x=[1 +- V(1+4)]/2 = (1+V5)/2, (1-V5)/2
You should master the method and do a few of them, otherwise copying homework will not help

Four steps of solving quadratic equation with one variable by formula method
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1. Write a =, B =, C=
2. If B ^ - 4ac is greater than or equal to 0, the original equation has two unequal real roots. If B ^ - 4ac is equal to 0, it has two equal real roots. If B ^ - 4ac is less than 0, it has no real roots
3. Bring the number a, B, C into the formula
4. Work out the formula for Part 3