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i think tha ans is 24²....
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i) (30-6)^2= 30^2+6^2-2×30×6
= 900+36-360
= 576
(20+4)^2= 20^2+4^2+2×4×20
= 400+16+160
= 576
ii) (900-1)^2= 900^2+1^2-2×900×1
= 810000+1-1800
= 808201
(800+99)^2= 800^2+99^2+2×800×99
= 640000+9801+158400
= 808201
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