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(i) 4x2 +9y2 +12xy = (2x)2 +(3y)2 + 2x2x x3y= (2x + 3y).(ii) a4 + 25b4 -10a²b2 = (ap)2 + (5b2)2 - 2x a? x5b?(a? -5b2).EXERCISE 7Cctorise:x2 + 8x +162. x2 +14x + 493.1 + 2x + x?. 9 +62 +225. x2 + bax +9a?6. 4y² + 20y +257. 36a236a +98. 9m2 +24m +1619. Z2 +2+4. 49a2 +84ab +36b211. p? -10 p +2512.12la? -88ab +3. 1 - 6x + 9x14. 9y- 12y +415. 16x2 - 24x +96. m2 - 4mn + 4n217. a²b2 - 6abc +9c2 18. m4 +2m?n? +9. (1+m)2 - 41mHint. Given exp. = 1+ m² +2 lm - 4lm = (1 + m² - 2 lm).2OF QUADRATIC TRINOMIALS |
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