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3 years ago

Expand using identities: (i) (2x- 5y)² (ii) (11a + 2) (11a – 2) (iii) (7m + 3) (7m + 3)

Mathematics

1 answer:

natulia [17]3 years ago

7 0

Answer:

Step-by-step explanation:

(2x-5y)^2

(2x-5y)(2x-5y)

4x^2-10xy-10xy+25y^2

4x^2-20xy+25y^2

------------------------------

(11a+2)(11a-2)

121a^2+22a-22a-4

121a^2-4

------------------------------

(7m+3)(7m+3)

49m^2+21m+21m+9

49m^2+42m+9

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$\\ \rm\longmapsto 115.90+115.90+345.85$

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