By
USING FORMULA
x = -b ± ⌠ b² - 4ac
2a
Example :
Solve the QE by using formula
→ x² + 4x - 2 = 0
a = 1 , b = 4 , c = -2
x = -(4) ± ⌠ (4)² - 4(1)(-2)
2(1)
x = -4 ± ⌠ 16 + 8
2
x = -4 ± ⌠ 24
2
x = -4 ± 4.8989
2
either x = -4 + 4.8989 or x = -4 - 4.8989
2 2
x = o.449 , -4.449
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By
FACTORISATION
example ;
Solve or determine the roots or find the value of unknown ( a = 1 )
1. x² + 3x - 4 = 0
( x - 1 ) ( x + 4 ) = 0
either x-1 = 0 or x+4 = 0
x = 1 or x = -4
answer can be write in 3 ways ,
→ x = 1 and -4
→ x = 1 or -4
→ x = 1 , -4
2. x² + 10x + 24 = 0
( x + 6 ) ( x + 4 ) = 0
either x+6 = 0 or x+4 = 0
x = -6 or x = -4
x = -6 , -4
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