PLEASE HELP ME!!!!!!(FORM 2 QUESTION)
1.Please factorize these question:
A.50-8y^2
B.20-7x-6x^2
C.-343-8y^3
Please help me.
Maths questions!!!!!!(20 marks)Exam will started on Tuseday!
2008-06-15 7:20 pm
回答 (2)
2008-06-15 7:33 pm
✔ 最佳答案
1.50-8y^2
=2(25-4y^2)
=2[5^2-(2y^2)]
=2(5+2y)(5-2y)
2.
20-7x-6x^2
=-(6x^2+7x-20)
=-(3x-4)(2x+5)
3.
-343-8y^3
=-[7^3 + (2y)^3]
=-(7+2y)[7^2-7(2y)+(2y)^2]
=-(7+2y)(49-14y+4y^2)
2008-06-17 7:33 pm
A.50-8y2=2(25-4y2)
=2[(5)2-(2y)2]
=2(5-2y)(5+2y)
B.20-7x-6x2=(5-2x)(4+3x)
C.-343-8y3=(7)3-(2y)3
=(7-2y)(49+14y+4y2)
2008-06-17 11:34:07 補充：
C.-343-8y^3=-[(7)^3+(2y)^3]
=-(7+2y)(49-14y+4y2)
=2[(5)2-(2y)2]
=2(5-2y)(5+2y)
B.20-7x-6x2=(5-2x)(4+3x)
C.-343-8y3=(7)3-(2y)3
=(7-2y)(49+14y+4y2)
2008-06-17 11:34:07 補充：
C.-343-8y^3=-[(7)^3+(2y)^3]
=-(7+2y)(49-14y+4y2)
收錄日期: 2021-04-23 20:35:10
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