1) Simplify ( 4x² - 2x ) + ( 5x² + x )
2) Simplify a ² a* / a¯ ²
( * = degree 4 )
3) Factorize x ² +7x + 12
Maths questions
2007-08-14 2:28 am
回答 (2)
2007-08-14 2:35 am
✔ 最佳答案
( 1 ) ( 4x² - 2x ) + ( 5x² + x )= 4x^2 - 2x + 5x^2 + x
= 9x^2 - x
( 2 ) a ² a^4 / a^( -2 )
= a^2 a^4 a^2
= a^ ( 2 + 4 + 2 ) ---> ( By laws of indices )
= a^8
( 3 ) By cross-method,
x^2 + 7x + 12 = ( x + 4 )( x + 3 )
參考: My Maths Knowledge
2007-08-14 2:38 am
1) Simplify ( 4x² - 2x ) + ( 5x² + x )=(4+5)x²+(-2+1)x=9x²-x
2) Simplify a ² a* / a¯ ²=a* [*=2+4-(-2)=8]
3) Factorize x ² +7x + 12=(x+3)(x+4)
2) Simplify a ² a* / a¯ ²=a* [*=2+4-(-2)=8]
3) Factorize x ² +7x + 12=(x+3)(x+4)
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