please answer all questions I mark you In brainlist
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विल्सन ने अपनी दिसूत्री सिद्धांतों की घोषणा कब की थी
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6. (7⁵ ÷ 7²) × 7
= (7 × 7 × 7 × 7 × 7 ÷ 7 × 7) × 7
= 7⁵⁻² × 7
= 7³ × 7
= 7⁴
7. 3x + 3y - (x + 4xy + y)
= 3x + 3y - x - 4xy - y
= 2x + 2y - 4xy
9. A + B - C
= 2x + 3 + 3(x - 2) - (4x - 7)
= 2x + 3 + 3x - 6 - 4x + 7
= (2 + 3 - 4)x + (3 - 6 + 7)
= x + 4
10. (a) 2xy and 6xy ; -3x²y² and 7y²x²
(b) A trinomial has 3 terms separated by a (+) or (-).
12. (b) 3x - 8 - 14x + 2x + 17 when x = 2
3x - 8 - 14x + 2x + 17
= 3 × 2 - 8 - 14 × 2 + 2 × 2 + 17
= 6 - 8 - 28 + 2 + 17
= 25 - (8 + 28)
= 25 - 36
= -11
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